remove fresco proguard rules

Summary:
Fresco now maintain proguard rules by itself (https://github.com/facebook/fresco/pull/2075), so it won't be necessary for react native copy its rules.
Run RNTTester Android app in release mode, app build successful and won't crash in ImageModule.

none

 [ANDROID] [BUGFIX] [PROGUARD] - remove fresco proguard rules
Closes https://github.com/facebook/react-native/pull/19040

Differential Revision: D7992146

Pulled By: hramos

fbshipit-source-id: 9ee3dd4c6756472395ec9e36a967b469f0760999

ReactAndroid/proguard-rules.pro

@@ -69,22 +69,3 @@
 -dontwarn java.nio.file.*
 -dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
 -dontwarn okio.**
-
-# Fresco
-# Keep our interfaces so they can be used by other ProGuard rules.
-# See http://sourceforge.net/p/proguard/bugs/466/
--keep,allowobfuscation @interface com.facebook.soloader.DoNotOptimize
-
-# Do not strip any method/class that is annotated with @DoNotOptimize
--keep @com.facebook.soloader.DoNotOptimize class *
--keepclassmembers class * {
-    @com.facebook.soloader.DoNotOptimize *;
-}
-
-# Keep native methods
--keepclassmembers class * {
-    native <methods>;
-}
-
--dontwarn javax.annotation.**
--dontwarn com.facebook.infer.**